Continuous ultrathin UiO-66-NH2 coatings on polymeric substrate synthesized by layer-by-layer method: a kind of promising membranes for oil-water separation
In this paper, we successfully controllably synthesize continuous nanothickness MOF coatings (NTMC) by layer-by-layer method on polymeric substrate. The polymeric substrate was pretreated by high energy ɣ-irradiation to induce high surface density of living reactive groups, which ensure the formation of continuous surface-integrated NTMC. SEM, FT-IR and XPS were used to characterize NTMCs. The thickness and morphology were tuned by the LBL cycles, and NTMCs with a thickness of ~44 nm were obtained. The chemical bonds between NTMC and polymeric substrate was confirmed by XPS and EDS. Moreover, the NTMCs exhibit good performance in oil-water separation. We believe our work will promote the design and precise synthesis of high-performance MOF based membranes for multiple practical applications in future.